[9] RFR: 8147754: Configure fails to detect freetype installed by XQuartz on OSX 10.11

[David DeHaven]

JBS link:
https://bugs.openjdk.java.net/browse/JDK-8147754

Please review this small fix for locating Freetype with the updated version of XQuartz (for OSX 10.11):

--- cut here ---
diff --git a/common/autoconf/lib-freetype.m4 b/common/autoconf/lib-freetype.m4
--- a/common/autoconf/lib-freetype.m4
+++ b/common/autoconf/lib-freetype.m4
@@ -349,6 +349,14 @@
             LIB_CHECK_POTENTIAL_FREETYPE([$FREETYPE_BASE_DIR/include], [$FREETYPE_BASE_DIR/lib], [well-known location])
           fi
 
+          if test "x$OPENJDK_TARGET_OS" = xmacosx; then
+            if test "x$FOUND_FREETYPE" != xyes; then
+              # Due to changes in OSX 10.11 XQuartz now installs to /opt/X11
+              FREETYPE_BASE_DIR="$SYSROOT/opt/X11"
+              LIB_CHECK_POTENTIAL_FREETYPE([$FREETYPE_BASE_DIR/include], [$FREETYPE_BASE_DIR/lib], [well-known location])
+            fi
+          fi
+
           if test "x$FOUND_FREETYPE" != xyes; then
             FREETYPE_BASE_DIR="$SYSROOT/usr/sfw"
             LIB_CHECK_POTENTIAL_FREETYPE([$FREETYPE_BASE_DIR/include], [$FREETYPE_BASE_DIR/lib], [well-known location])
--- cut here ---

Tested on OSX 10.11 (El Capitan) with XQuartz 2.7.8:
$ sh ./configure
...
checking for freetype includes... /opt/X11/include/freetype2
checking for freetype libraries... /opt/X11/lib
...

Build seems to work fine too.

-DrD-